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ios 字符串

假设要查询的字符串味: NSString *searchStr = @"a string with substr"; 查询(是否)被包含的字符串为@"substr",则通过下面的判断: if ([searchStr rangeOfString:@"substr"].location != NSNotFound) { //条件为真,表示字符串searchStr包...

NSString *str = @"123"; str = [str stringByAppendingString:@"456"]; str = [str stringByAppendingFormat:@"%@%d", @"456", 789];

1, 创建一个NSString对象 简单方法: NSString *aString = @"我是个NS字符串!"; //除了引号外加@, 没别的区别不需要操心内存管理 NSString *aString = [[NSString alloc] initWithFormat:@"这也是个NS字符串!"];//要去retain和release这个字符...

- (void)viewDidLoad { [super viewDidLoad]; NSDictionary *dict = @{@"aaa":@"11",@"bb":@"22",@"cc":@"33"}; NSString *str = [self dictionaryToJson:dict]; NSDictionary *dict1 = [self dictionaryWithJsonString:str]; NSLog(@"%@",str);...

都代表空,做判断时都是NO 区别在于nil为NS的范畴,当向nil发送消息时,不做任何操作,但是当向null发送消息时,直接crash

//有两种方法 NSString *originalString = @"I wanna go to the Rio Olympics"; //1.substringFromIndex: 从第18位字符开始到最后的字符的字符串截取 NSString *subfixString = [originalString substringFromIndex:18]; //2.substringWithRange...

代码如下: NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateStyle:NSDateFormatterMediumStyle]; [dateFormatter setTimeStyle:NSDateFormatterNoStyle]; [dateFormatter setTimeZone:GTMzone]; NSDa...

1、NSData 转NSString NSString *result =[[ NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 2、字符串转Data NSString *str =@"jesfds"; NSData *data =[str dataUsingEncoding:NSUTF8StringEncoding];

+ (id)stringWithContentsOfFile:(NSString *)path usedEncoding:(NSStringEncoding *)enc error:(NSError **)error; 是自动判断encode,如果打开成功,把encode放在enc 里,返回给调用者。 声明一个NSStringEncoding 类型(其实就是NSUInteger...

NSString *str = @"str"; const char *ch = [str cStringUsingEncoding:NSASCIIStringEncoding]; for (int i = 0; i < strlen(ch); i++) { printf("%c", ch[i]); }

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